the fbi's billion-dollar project will use available surveillance cameras to scan faces and match those images against their national database of known criminals. dubbed the next generation identification program, face recognition, dna, iris scans and voice identification will make it harder for the most wanted to hide. some worry about the potential to invade privacy. others believe it's a crime-fighting tool whose time has come. >> you've got to go after them where they are, go after them smart, intelligence and special operations units. >> reporter: and as we approach the anniversary of september 11th a new bulletin obtained by abc news from law enforcement says officials have been told of a decline in 9/11 messaged by al qaeda, but warned lone offender threats are still a concern. security sources tell us attack buys lone wolves are harder to track making new technology all the more useful. >> i am placing you under arrest for the murder of sara marx. >> reporter: even if we're nowhere near being able to predict crimes before they happen. the fbi tells us the program will be fully r